Repeat footers in paginated context

third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 1131 matching lines @@
   line_box.SetIsFirstAfterPageBreak(false);
   LayoutState* layout_state = View()->GetLayoutState();
   if (!layout_state->IsPaginated())
     return;
   if (!IsPageLogicalHeightKnown())
     return;
   LayoutUnit page_logical_height = PageLogicalHeightForOffset(logical_offset);
   LayoutUnit remaining_logical_height = PageRemainingLogicalHeightForOffset(
       logical_offset, kAssociateWithLatterPage);
   int line_index = LineCount(&line_box);
-  if (remaining_logical_height < line_height ||
+  // We need to detect if we overlap a repeating footer and if so take the
+  // full remaining logical height as our strut to the next page.
+  LayoutUnit remaining_logical_height_including_footer =
+      remaining_logical_height - layout_state->HeightOffsetForTableFooters();
+  if (remaining_logical_height_including_footer < line_height ||
       (ShouldBreakAtLineToAvoidWidow() &&
        LineBreakToAvoidWidow() == line_index)) {
     LayoutUnit pagination_strut = CalculatePaginationStrutToFitContent(
         logical_offset, remaining_logical_height, line_height);
     LayoutUnit new_logical_offset = logical_offset + pagination_strut;
     // Moving to a different page or column may mean that its height is
     // different.
     page_logical_height = PageLogicalHeightForOffset(new_logical_offset);
     if (line_height > page_logical_height) {
       // Too tall to fit in one page / column. Give up. Don't push to the next
@@ skipping 86 matching lines @@
     return logical_offset;
   LayoutUnit child_logical_height = LogicalHeightForChild(child);
   // Floats' margins do not collapse with page or column boundaries.
   if (child.IsFloating())
     child_logical_height +=
         MarginBeforeForChild(child) + MarginAfterForChild(child);
   if (!IsPageLogicalHeightKnown())
     return logical_offset;
   LayoutUnit remaining_logical_height = PageRemainingLogicalHeightForOffset(
       logical_offset, kAssociateWithLatterPage);
-  if (remaining_logical_height >= child_logical_height)
+  LayoutUnit remaining_logical_height_including_footer =
+      remaining_logical_height -
+      View()->GetLayoutState()->HeightOffsetForTableFooters();
+  if (remaining_logical_height_including_footer >= child_logical_height)
     return logical_offset;  // It fits fine where it is. No need to break.
   LayoutUnit pagination_strut = CalculatePaginationStrutToFitContent(
       logical_offset, remaining_logical_height, child_logical_height);
   if (pagination_strut == remaining_logical_height &&
       remaining_logical_height == PageLogicalHeightForOffset(logical_offset)) {
     // Don't break if we were at the top of a page, and we failed to fit the
     // content completely. No point in leaving a page completely blank.
     return logical_offset;
   }
 
@@ skipping 3472 matching lines @@
         include_block_overflows);
 }
 
 void LayoutBlockFlow::InvalidateDisplayItemClients(
     PaintInvalidationReason invalidation_reason) const {
   BlockFlowPaintInvalidator(*this).InvalidateDisplayItemClients(
       invalidation_reason);
 }
 
 }  // namespace blink